TCP/IP Protocol Suite1Chapter 4Chapter 4Objectives Upon completion you will be able to:IP Addresses:IP Addresses:Classful AddressingClassful Addressing•Understand IPv4 addresses and classes•Identify the class of an IP address•Find the network address given an IP address•Understand masks and how to use them•Understand subnets and supernets

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TCP/IP Protocol Suite24.1 INTRODUCTIONThe identifier used in the IP layer of the TCP/IP protocol suite to The identifier used in the IP layer of the TCP/IP protocol suite to identify each device connected to the Internet is called the Internet identify each device connected to the Internet is called the Internet address or IP address. An IP address is a address or IP address. An IP address is a 32-bit address32-bit address that uniquely that uniquely and universally defines the connection of a host or a router to the and universally defines the connection of a host or a router to the Internet. IP addresses are unique. They are unique in the sense that Internet. IP addresses are unique. They are unique in the sense that each address defines one, and only one, connection to the Internet. Two each address defines one, and only one, connection to the Internet. Two devices on the Internet can never have the same address. devices on the Internet can never have the same address. The topics discussed in this section include:The topics discussed in this section include:Address SpaceAddress SpaceNotationNotation

TCP/IP Protocol Suite3An IP address is a 32-bit address.Note:Note:

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TCP/IP Protocol Suite10Find the error, if any, in the following IP addresses:a. 111.56.045.78b. 221.34.7.8.20c. 75.45.301.14d. 11100010.23.14.67Example 3Solutiona. There are no leading zeroes in dotted-decimal notation (045).b. We may not have more than four numbers in an IP address.c. In dotted-decimal notation, each number is less than or equalto 255; 301 is outside this range.

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